<!DOCTYPE html>
<html>
<head>
    <meta http-equiv="content-type" content="text/html; charset=UTF-8"/>
    <script src="../../scripts/jquery.min.js"></script>
</head>
<body>
<button>Start</button>
<div>aaa</div>
<span>eee</span>
<script>
    jQuery.extend({
        min: function(a, b) { return a < b ? a : b; },
        max: function(a, b) { return a > b ? a : b; }
    });
    $("div").text("哈哈");
    $("span").textContent = "哈哈";

</script>
</body>
</html>